show off iterators
show off iterators

dtwood/piston-image,hetzge/image,lady-segfault/image,mbrubeck/image,tomaka/image,ruud-v-a/image,TyOverby/rust-image,theotherphil/image,twoodford/image,JaySon-Huang/image,PistonDevelopers/image,nwin/rust-image,huonw/image,PistonDevelopers/image,bvssvni/image